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Old 06-11-2006, 03:52 PM
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electric fan

i got a 1996 chevy lumina with a 3.1 in it and the problem is only one cooling fan will work. one fan will run when you turn on the a/c but the other fan wont start. i checked the relays, and fuses they were fine. i ran a jumper to the fan and it started to run so the motor is good. is the fan switch bad if so does anyone know where the fan switch i located on this car?

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Old 06-12-2006, 03:09 PM
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You will need to get a shop manual that shows the location of the temperature sensor.
It will be located on the engine in the cooling system but possibly it sends a signal to the computer and the computer decides when to run the fan.
Also it's possible that the engine in not getting hot enough to need the fan.
A good source for this information is www.alldatadiy.com or your local Library.

Vicrod
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Old 06-12-2006, 03:35 PM
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Doc here,

Vicrod hit it right on the head..

The Computer controls the signals to the relay (s) , Pins 31 and 32 of the ECM are for control of the relay switching, and Pin 52 of the ECM controls the Air conditioner switching of the cooling fan..ALL of these are low data signals.

The Schematic DOES not show where the relay gets it's power from, I assume it's from a switched source at the convenience Center, or fuse panel or fuse link in the engine bay..

You need to determine that the relays are actually switching as needed, by either running it up to temp "feeling the relay (s) for a "Click..OR remove the relay (s) and jumper between the Center Wiper contact and the Normally Open Contact.

If jumpered, and still won't run the fan (s) you either need a better diagram that shows where the relay CONTACT picks up power..OR ..Hand over Hand the wire from the relay socket to it's termination point, then measure for Power at said point...If it is dead..find out what feeds it and replace / repair as needed.

If it does run..then you need to look into the Temp sender switch, It will be mounted traditionally in one of three places..The intake manifold water jacket, the t'stat housing , or the radiator lower tank. Test or replace this switch.

Doc
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